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outlined-fn-may-clobber-lr-in-caller.ll
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outlined-fn-may-clobber-lr-in-caller.ll
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
; RUN: llc -mtriple=thumbv7m-none-none-eabi < %s | FileCheck %s
target datalayout = "e-m:o-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
%struct.wibble = type { [30 x i8], i8, i32 }
%struct.eggs = type { i32, [30 x i8], i8, i8, i8, [3 x i8] }
@global = external global [3 x %struct.wibble], align 4
@global.1 = external global [3 x %struct.wibble], align 4
; Test case to make sure calling an outlined function does not clobber LR used
; by a tail call in caller.
; FIXME: Currently bl OUTLINED_FUNCTION_0 clobbers LR, which in turn is used
; by the later call to memcpy to return to the caller.
define void @test(ptr nocapture noundef writeonly %arg, i32 noundef %arg1, i8 noundef zeroext %arg2) unnamed_addr #0 {
; CHECK-LABEL: test:
; CHECK: @ %bb.0: @ %bb
; CHECK-NEXT: cmp r1, #2
; CHECK-NEXT: beq .LBB0_3
; CHECK-NEXT: @ %bb.1: @ %bb
; CHECK-NEXT: cmp r1, #1
; CHECK-NEXT: bne .LBB0_5
; CHECK-NEXT: @ %bb.2: @ %bb4
; CHECK-NEXT: bl OUTLINED_FUNCTION_0
; CHECK-NEXT: ldr r2, .LCPI0_1
; CHECK-NEXT: b .LBB0_4
; CHECK-NEXT: .LBB0_3: @ %bb14
; CHECK-NEXT: bl OUTLINED_FUNCTION_0
; CHECK-NEXT: ldr r2, .LCPI0_0
; CHECK-NEXT: .LBB0_4: @ %bb4
; CHECK-NEXT: add.w r1, r2, r1, lsl #2
; CHECK-NEXT: adds r0, #4
; CHECK-NEXT: movs r2, #30
; CHECK-NEXT: b __aeabi_memcpy
; CHECK-NEXT: .LBB0_5: @ %bb24
; CHECK-NEXT: .save {r7, lr}
; CHECK-NEXT: push {r7, lr}
; CHECK-NEXT: bl wombat
; CHECK-NEXT: @APP
; CHECK-NEXT: @NO_APP
; CHECK-NEXT: pop {r7, pc}
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: @ %bb.6:
; CHECK-NEXT: .LCPI0_0:
; CHECK-NEXT: .long global.1
; CHECK-NEXT: .LCPI0_1:
; CHECK-NEXT: .long global
bb:
%gep = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 4
%zext = zext i8 %arg2 to i32
switch i32 %arg1, label %bb24 [
i32 1, label %bb4
i32 2, label %bb14
]
bb4: ; preds = %bb3
store i8 1, ptr %gep, align 4, !tbaa !6
%gep5 = getelementptr inbounds [3 x %struct.wibble], ptr @global, i32 0, i32 %zext
%gep6 = getelementptr inbounds [3 x %struct.wibble], ptr @global, i32 0, i32 %zext, i32 2
%load = load i32, ptr %gep6, align 4, !tbaa !11
%gep7 = getelementptr inbounds [3 x %struct.wibble], ptr @global, i32 0, i32 %zext, i32 1
%load8 = load i8, ptr %gep7, align 2, !tbaa !13
%gep9 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 3
%gep10 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 2
store i8 30, ptr %gep10, align 2, !tbaa !16
%gep11 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 1
tail call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(30) %gep11, ptr noundef nonnull align 4 dereferenceable(30) %gep5, i32 30, i1 false)
br label %bb26
bb14: ; preds = %bb12
store i8 1, ptr %gep, align 4, !tbaa !6
%gep16 = getelementptr inbounds [3 x %struct.wibble], ptr @global.1, i32 0, i32 %zext
%gep17 = getelementptr inbounds [3 x %struct.wibble], ptr @global.1, i32 0, i32 %zext, i32 2
%load18 = load i32, ptr %gep17, align 4, !tbaa !21
%gep19 = getelementptr inbounds [3 x %struct.wibble], ptr @global.1, i32 0, i32 %zext, i32 1
%load20 = load i8, ptr %gep19, align 2, !tbaa !23
%gep21 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 3
%gep22 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 2
store i8 30, ptr %gep22, align 2, !tbaa !16
%gep23 = getelementptr inbounds %struct.eggs, ptr %arg, i32 0, i32 1
tail call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(30) %gep23, ptr noundef nonnull align 4 dereferenceable(30) %gep16, i32 30, i1 false)
br label %bb26
bb24: ; preds = %bb
tail call void @wombat()
tail call void asm sideeffect "", ""()
br label %bb26
bb26: ; preds = %bb24, %bb14, %bb12, %bb4, %bb3
ret void
}
declare void @wombat()
declare void @llvm.memcpy.p0.p0.i32(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i32, i1 immarg) #2
attributes #0 = { minsize noimplicitfloat nounwind optsize }
!6 = !{!7, !9, i64 36}
!7 = !{!"", !8, i64 0, !9, i64 4, !9, i64 34, !9, i64 35, !9, i64 36, !9, i64 37}
!8 = !{!"long", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}
!11 = !{!12, !8, i64 32}
!12 = !{!"B", !9, i64 0, !9, i64 30, !8, i64 32}
!13 = !{!12, !9, i64 30}
!14 = !{!7, !8, i64 0}
!15 = !{!7, !9, i64 35}
!16 = !{!7, !9, i64 34}
!21 = !{!22, !8, i64 32}
!22 = !{!"A", !9, i64 0, !9, i64 30, !8, i64 32}
!23 = !{!22, !9, i64 30}